dy/dx = x(1-2y)
∫dy/(1-2y) = ∫xdx
-0.5ln(1-2y) = 0.5x²+0.5C
ln(1-2y) = -x²-C
1-2y = exp(-x²-C)
y = -0.5 exp(-x²-C) + 0.5
y = C e^(-x²) + 0.5